Help! electrical issue...I think?

Hi I've had my new (1999) silverado for 1 week and 2day she wouldn't start! Truck is like new inside and out and runs like it's new...60K mi. Sometimes the security light stays on while driving and the manual says that could be a problem with the passlock system? The truck always starts the instant you turn the key but 2day while out running errands she wouldn't start? She tried to start but it seemed that something electrical was shutting it down before it could keep running? I tried several times and same result. I waited about 20 min and tried again and it started right up? Any help will be greatly appreciated!

Security will cut fuel pump off ..can you hear pump run when a no crank? Do you know the procedure to clear security ?
Should be in your service manual ..
Oh if you hear pump.. will not be security need to check fuel relay, maybe getting hot /intermittent and pressure.

Hey thanks man ..from what I have found out so far the passlock system is bad or going bad...mechanic says they all go bad..junk system ...and it costs about 500 to 600 to replace it ...and he is cheaper than a dealership. I knew I shoulda bought another toyota!

Is this the pass lock II system? Guys disable them all the time and get aftermarket alarms. Do you have tilt wheel....sometimes if it only seems to be problem when the wheel is tilted at a certain posistion the harness is bad only.

If you google " disable passlock security system" you will find what your looking for.

thanks again for your help! I've only had a no start situation 1 time so far... been using my car this week to prevent getting stranded. I was upset when it happened and didn't pay attention to fuel pump...next time I will listen for fuel pump. Found out my friend's malibu does the same thing...and he resets it by leaving the key in the on position for 10 mins... turn key off and then it starts?

thanks again for your help! I've only had a no start situation 1 time so far... been using my car this week to prevent getting stranded. I was upset when it happened and didn't pay attention to fuel pump...next time I will listen for fuel pump. Found out my friend's malibu does the same thing...and he resets it by leaving the key in the on position for 10 mins... turn key off and then it starts?